Red Orchestra ?

[Jobu88]

This is a personal endorsement for anyone who's been thinking about getting Call of Duty 5 World at War for their PC. It rocks. And in general I do not play shooter games since I'm too old to keep up with the kids. Very entertaining single player, and multi-player online (for free, by the way) is a hoot. You alternate playing a US Marine and a Soviet infantryman in single player. Multiplayer is either German v. Russian or USMC v. Japanese.

I will also endorse Call of Duty 4, with the stipulation that I play only on a server that prohibits the usual run-n-gun tactics that the kids use.

Blood Brigade http://www.bloodbrigade.net/bb/

They enforce walking in a crouch or with the sight up ( no running) and they also ban the special magic abilities that are available in the game. Very entertaining. I haven't played shooter games in nearly a decade, but I love these two.